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Effect of subclinical intramammary infection on somatic cell counts, NAGase activity and gross composition of goats' milk

Published online by Cambridge University Press:  23 July 2004

Gabriel Leitner
Affiliation:
National Mastitis Reference Centre, Kimron Veterinary Institute, Israel
Uzi Merin
Affiliation:
Department of Food Science, Institute of Technology and Storage of Agricultural Products
Nissim Silanikove
Affiliation:
Department of Animal Physiology, Institute of Animal Science, Agricultural Research Organization, The Volcani Centre, Israel
Efraim Ezra
Affiliation:
Israel Cattle Breeders Association, Caesarea, Israel
Marcelo Chaffer
Affiliation:
National Mastitis Reference Centre, Kimron Veterinary Institute, Israel
Natan Gollop
Affiliation:
Department of Food Science, Institute of Technology and Storage of Agricultural Products
Marta Winkler
Affiliation:
National Mastitis Reference Centre, Kimron Veterinary Institute, Israel
Anita Glickman
Affiliation:
National Mastitis Reference Centre, Kimron Veterinary Institute, Israel
Arthur Saran
Affiliation:
National Mastitis Reference Centre, Kimron Veterinary Institute, Israel

Abstract

The study was aimed at identifying the pathogens causing subclinical udder infections in representative Israeli dairy goat herds and determining their effect on milk quality. Five hundred goats in ten flocks of various breeds and crossbreeds were surveyed. Of the 500 goats, 13·4% were in their first lactation, 36·4% were in their second lactation and 50·2% were in their third or higher lactation. Percentages of udder halves with subclinical intramammary infection in the flocks ranged from 35 to 71%. The effect of the bacteriological infection on somatic cells count (SCC) was significant (P<0·001). Various species of coagulase-negative staphylococci (CNS), mainly Staphylococcus caprae and Staphylococcus epidermidis, were the main pathogens in infected udder halves. Lactation number did not significantly influence either infection rate of udder halves or SCC, although the percentage of udder halves with no bacteriological findings was higher at the first lactation than at the third lactation. Milk composition (fat, protein and lactose) varied among flocks, with lower mean total protein in uninfected halves than in infected ones and higher lactose in uninfected than infected halves.

Type
Research Article
Copyright
Proprietors of Journal of Dairy Research 2004

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